42 A. Alcock — Carcinological Fauna of India. [No. 1, 



For a long time I thought I could recognize three distinct species 

 differing from one another (1) in relative length of carapace, (2) in 

 relative length and in sculpture of clielipeds, especially of the hands, 

 and (3) in the degree of prominence of the inner supra-orhital angle. 

 But after a careful examination of 83 specimens I find that all these 

 differences are inconstant, as Miers has already said. 



21. Neptunus (Hellenus) tenuipes, De Haan. 



Amphitrite tenuipes, De Haan, Faun. Japon. Crust, p. 39, pi. i. fig. 4 : Haswell, 

 Cat. Austral. Crust, p. 83. 



Neptunus tenuipes, A. Milne Edwards, Archir. dn Mns. X. 1861, pp. 335, 339 : 

 Thallwitz, Abh. Zool. Mus. Dresden, 1890-91, No. 3. p. 48: Ortmann, Zool. Jahrb., 

 Syst. VII. 1893, p. 74. 



Carapace little convex, its length about f its breadth without the 

 spines, its surface sufl&ciently tomentose to appear almost smooth, but 

 when denuded it is found to be cut up into well defined sub-regional 

 elevations the convexities alone of which are granular. 



Front prominent beyond the inner supra-orbital angles and beyond 

 the epistome, cut into three bluntly triangular teeth, of which the 

 middle one is slightly the smaller and less prominent. Supra-orbital 

 border cut by two- fissures. 



Antero-lateral border cut into 9 close-set teeth (including the outer 

 orbital angle) of which the last is about three times as long as any of 

 the others. The posterior border is slightly curved and meets the 

 postero-lateral borders at a well-marked angle, which is sometimes 

 slightly turned up. 



Eyes large, reniform, not concealed by the almost completely dorsal 

 orbits. Outer angle of merus of external maxillipeds not produced 

 laterally. 



Chelipeds in the adult male about 2 J times the length of the cara- 

 pace, the hand being the most massive segment. Arm with 3 spines on 

 the anterior (inner) border and 1 at the far end of the outer border : 

 both inner and outer angle of wrist spiniform, the inner most conspicu- 

 ously so. Hand costate, the costse serrulate ; armed with 2 spines, one 

 being in front of the apex of the wrist-joint, the other slightly behind 

 the finger- joint. 



First 3 pair of legs slender, the first pair hardly shorter than the 

 chelipeds. 



Abdomen of male sinuous. 



In the Indian Museum are 14 specimens from the Andamans. 



22. Neptunus (Hellemis) tuherculosus, A. M. Edw. 

 Neptunus tuherculosus, A, Milne Edwards, Arohiv. da Hub. X. 1861, pp. 333, 339, 



